Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e67a3b00050d23f…

MALICIOUS

PDF

70.8 KB Created: 2021-06-23 06:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6a54089adbdc06c3bbfb396d61ac2178 SHA-1: bf735429c8e14b9d4ee259cd8b73ef2f717d25e6 SHA-256: 6e67a3b00050d23f075ceb194fd6b4970ce5a3a6638ada89f7aa59d7ff388bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though truncated, includes a lure related to downloading an MP3, further supporting a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=till+the+end+of+time+2pac+mp3+download PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a873d3f7---9899439993.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/domavubozo.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5mg1e5n8a2odci9kgip5mpl1r3/90608746342.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/1d67ad1700092f3871eaf1f29e87b037/lakasineg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af90623c6---62994642631.pdfIn PDF document text
    • http://sowitech.vn/upload/files/lijag.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e7ba1325---64536690480.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74cbf0900---kujimodazuv.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c89511aa1---78847539755.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/104c343312e91d64da2e6303d8e32639/76825272359.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/noluger.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file/%5C/2021051712131415.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf33c24c634---dusipizewasujefus.pdfIn PDF document text
    • http://www.asslar.de/downloads/20841579361.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/2raoan66s23i1dculp0o5l0h1i/vuvuletamukosaxu.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/ropijumi.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2682371c89---17576852229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 5456 bytes
SHA-256: 7fe719be3af3414285f323ff0224b4b3e5ef19fe5b2b038c3a4bb9d0201ab843
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 11276 bytes
SHA-256: ea5ab5bb80065cac1273860facd84ea89920649afb3b984c2a656c528deede03